Respostas

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2014-05-21T16:29:16-03:00
X + x² = 56
x² + x - 56 = 0

1 + 224 = 225 

-1 + 15 / 2 = 7
-1 - 15 / 2 = -8

7 e -8
1 5 1
2014-05-21T16:29:26-03:00
7................................................